| Jack Hollenback | |
| Birth Date: | 10 August 1884 |
| Birth Place: | Clearfield County, Pennsylvania, U.S. |
| Player Years1: | 1904 |
| Player Team1: | Penn |
| Coach Years1: | 1908–1909 |
| Coach Team1: | Franklin & Marshall |
| Coach Years2: | 1910 |
| Coach Team2: | Penn State |
| Coach Years3: | 1911 |
| Coach Team3: | Pennsylvania Military |
| Overall Record: | 21–11–3 |
John Coffey Hollenback (August 10, 1884 – 1959) was an American football player and coach. He served as the head football coach at Franklin & Marshall College from 1908 to 1909, Pennsylvania State University in 1910, and Pennsylvania Military College, now Widener University in 1911, compiling a career college football record of 21–11–3.
Hollenback was the older brother of Bill Hollenback, who was also a head football coach at Penn State. On December 28, 1910, he married Lulu Rowland, the daughter of Charles Hedding Rowland.[1]